Minecraft: 1.12.2
Forge: 14.23.5.2836

Mods: 1
ConsoleHUD-v1.3-1.12.2

Unless it's just me... I don't see the Tooltip appearing when selecting items. Tried with Enchanted Items, Shulker Boxes, and still... no Tooltip shows.

Going back to 'ConsoleHUD-v1.2-1.12.2'... the Tooltip appears as normal.

Issue still occurs in 'ConsoleHUD-v1.3.1-1.12.2'. I also tried updating Forge to '14.23.5.2838' and that didn't seem to do anything.

Yeah, I feared that might become an issue. What you need to do is to go into your options.txt file and change heldItemTooltips to true.

The reason this happened is that before v1.3 I was deactivating vanilla held item tooltips by changing that option. That wasn't a good thing, because after removing the mod the option might stay deactivated, so exactly what happened in your case. V1.3+ still checks for the heldItemTooltips option which is causing your problem. Will remove the check in the next version.

A fix was pushed as commit 530e3d1 and can be found as v1.3.2 on Curse.